Basically the vinegar (and water)helps break down the calcification that can build up and be almost impossible to scrub off. So I clean anything with buildup using the vinegar, powerheads and pumps esp. I soak for 12 or so hrs then scrub, just like new. Impellers and the casing for the impellers are a must to clean this way, if you don't that build up will eventually wreck things.
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